Here is my proposition for finding missing NULL tests. I tried to limit it to generic kmalloc like functions. There are of course many other NULL returning functions, but maybe they could be in an other rule, julia --- /// Look for kmalloc etc that are not followed by a NULL check. //# May give a false positive when the dereference is an argument of sizeof, or //# when the value is passed to another function that returns an error code. /// // Confidence: Moderate // Copyright: (C) 2015 Julia Lawall, Inria. GPLv2. // URL: http://coccinelle.lip6.fr/ // Options: --no-includes --include-headers virtual context virtual org virtual report @ok forall@ expression x; position p; statement S1,S2; @@ ( x =@p \(vmalloc\|kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|krealloc\| kmemdup\|kstrdup\|devm_kzalloc\|devm_kmalloc\|devm_kcalloc\| devm_kasprintf\|devm_kstrdup\|kmalloc_array\) (...,<+... __GFP_NOFAIL ...+>,...); | x =@p \(vmalloc\|kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|krealloc\| kmemdup\|kstrdup\|devm_kzalloc\|devm_kmalloc\|devm_kcalloc\| devm_kasprintf\|devm_kstrdup\|kmalloc_array\)(...) ... when != x ( if (x || ...) S1 else S2 | (x) == NULL | (x) != NULL | (x) == 0 | (x) != 0 ) ) // ---------------------------------------------------------------------------- @err depends on context || org || report exists@ identifier fld; position p != ok.p; expression x, y; position j0, j1, j2; @@ * x@j0 =@p \(vmalloc@j1\|kmalloc@j1\|kzalloc@j1\|kcalloc@j1\| kmem_cache_alloc@j1\|krealloc@j1\|kmemdup@j1\|kstrdup@j1\| devm_kzalloc@j1\|devm_kmalloc@j1\|devm_kcalloc@j1\| devm_kasprintf@j1\|devm_kstrdup@j1\|kmalloc_array@j1\)(...); ... when != (x) == NULL when != (x) != NULL when != (x) == 0 when != (x) != 0 when != x = y ( x@j2->fld | *x@j2 | x@j2[...] ) // ---------------------------------------------------------------------------- @script:python err_org depends on org@ j0 << err.j0; j1 << err.j1; j2 << err.j2; @@ msg = "NULL test needed." coccilib.org.print_todo(j0[0], msg) coccilib.org.print_link(j1[0], "") coccilib.org.print_link(j2[0], "") // ---------------------------------------------------------------------------- @script:python err_report depends on report@ j0 << err.j0; j1 << err.j1; j2 << err.j2; @@ msg = "NULL test needed, around lines %s,%s." % (j1[0].line,j2[0].line) coccilib.report.print_report(j0[0], msg) -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
